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If 18:30 :: 30 : x, then find the value of x.

A50

B40

C35

D45

Answer:

A. 50

Read Explanation:

to find the 4th proportion

18:30::30:x18:30 :: 30 : x

=30×3018=\frac{30\times 30}{18}

=90018=\frac{900}{18}

=1002=50=\frac{100}{2}=50


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